refactor(nix): cleanup package

flake.nix

@@ -85,7 +85,7 @@
             };
         in
         {
-          refraction = pkgs.callPackage ./nix/derivation.nix { inherit self; };
+          refraction = pkgs.callPackage ./nix/package.nix { };
 
           static-x86_64 = mkStatic { arch = "x86_64"; };
           static-aarch64 = mkStatic { arch = "aarch64"; };
@@ -97,7 +97,7 @@
       );
 
       overlays.default = _: prev: {
-        refraction = prev.callPackage ./nix/derivation.nix { inherit self; };
+        refraction = prev.callPackage ./nix/package.nix { };
       };
     };
 }

nix/derivation.nix

@@ -1,75 +0,0 @@
-{
-  lib,
-  stdenv,
-  go,
-  rustPlatform,
-  darwin,
-  self,
-  lto ? true,
-  optimizeSize ? false,
-}:
-rustPlatform.buildRustPackage {
-  pname = "refraction";
-  version =
-    (lib.importTOML ../Cargo.toml).package.version
-    + "-${self.shortRev or self.dirtyShortRev or "unknown-dirty"}";
-
-  __structuredAttrs = true;
-
-  src = lib.fileset.toSource {
-    root = ../.;
-    fileset = lib.fileset.unions [
-      ../src
-      ../build.rs
-      ../Cargo.lock
-      ../Cargo.toml
-      ../tags
-    ];
-  };
-
-  cargoLock = {
-    lockFile = ../Cargo.lock;
-  };
-
-  buildInputs = lib.optionals stdenv.hostPlatform.isDarwin (
-    with darwin.apple_sdk.frameworks;
-    [
-      CoreFoundation
-      Security
-      SystemConfiguration
-    ]
-  );
-
-  env =
-    let
-      toRustFlags = lib.mapAttrs' (
-        name:
-        lib.nameValuePair "CARGO_PROFILE_RELEASE_${
-          lib.toUpper (builtins.replaceStrings [ "-" ] [ "_" ] name)
-        }"
-      );
-    in
-    lib.optionalAttrs lto (toRustFlags {
-      lto = "thin";
-    })
-    // lib.optionalAttrs optimizeSize (toRustFlags {
-      codegen-units = "1";
-      opt-level = "s";
-      panic = "abort";
-      strip = "symbols";
-    });
-
-  # useful for container images
-  passthru.architecture = go.GOARCH;
-
-  meta = with lib; {
-    mainProgram = "refraction";
-    description = "Discord bot for Prism Launcher";
-    homepage = "https://github.com/PrismLauncher/refraction";
-    license = licenses.gpl3Plus;
-    maintainers = with maintainers; [
-      getchoo
-      Scrumplex
-    ];
-  };
-}

nix/package.nix

@@ -0,0 +1,68 @@
+{
+  lib,
+  stdenv,
+  go,
+  rustPlatform,
+  lto ? !optimizeSize,
+  optimizeSize ? false,
+}:
+
+let
+  fs = lib.fileset;
+  toRustFlags = flags: toString (lib.mapAttrsToList (name: value: "-C ${name}=${value}") flags);
+in
+assert lib.assertMsg (lto -> !optimizeSize) "`lto` and `optimizeSize` are mutually exclusive";
+rustPlatform.buildRustPackage rec {
+  pname = "refraction";
+  inherit (passthru.cargoToml.package) version;
+
+  src = fs.toSource {
+    root = ../.;
+    fileset = fs.intersection (fs.gitTracked ../.) (
+      fs.unions [
+        ../src
+        ../build.rs
+        ../Cargo.lock
+        ../Cargo.toml
+        ../tags
+      ]
+    );
+  };
+
+  cargoLock.lockFile = ../Cargo.lock;
+
+  # `panic=abort` breaks tests womp womp
+  doCheck = stdenv.buildPlatform.canExecute stdenv.hostPlatform && !optimizeSize;
+
+  env = {
+    RUSTFLAGS = toRustFlags (
+      lib.optionalAttrs lto {
+        lto = "thin";
+        embed-bicode = "yes";
+      }
+      // lib.optionalAttrs optimizeSize {
+        codegen-units = "1";
+        opt-level = "s";
+        panic = "abort";
+        strip = "symbols";
+      }
+    );
+  };
+
+  passthru = {
+    cargoToml = lib.importTOML ../Cargo.toml;
+    # For container images
+    dockerArchitecture = go.GOARCH;
+  };
+
+  meta = {
+    description = "Discord bot for Prism Launcher";
+    homepage = "https://github.com/PrismLauncher/refraction";
+    license = lib.licenses.gpl3Plus;
+    maintainers = with lib.maintainers; [
+      getchoo
+      Scrumplex
+    ];
+    mainProgram = "refraction";
+  };
+}